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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Design for a region-wide adaptive search for the ivorybilled woodpecker with the objective of estimating occupancy and related parameters Design for a region-wide adaptive search for the ivorybilled woodpecker with the objective of estimating occupancy and related parameters
We describe a survey design and field protocol for the Ivory-billed Woodpecker (Campephilus principalis) search effort that will: (1) allow estimation of occupancy, use, and detection probability for habitats at two spatial scales within the bird?s former range, (2) assess relationships between occupancy, use, and habitat characteristics at those scales, (3) eventually allow the...
Authors
R.J. Cooper, Rua S. Mordecai, B.G. Mattsson, M.J. Conroy, K. Pacifici, J.T. Peterson, C. T. Moore
Diplotriaena, Serratospiculum, and Serratospiculoides Diplotriaena, Serratospiculum, and Serratospiculoides
No abstract available.
Authors
Mauritz C. Sterner, Rebecca A. Cole
Ecology of coral reefs in the US Virgin Islands Ecology of coral reefs in the US Virgin Islands
The US Virgin Islands (USVI ) in the northeastern Caribbean, consist of St. Croix (207 km2), St. Thomas (83 km2), St. John (52 km2) and numerous smaller islands (Dammann and Nellis 1992). They are part of the Lesser Antilles and Leeward Islands on the eastern boundary of the Caribbean plate (Fig. 8.1). An extensive platform underlies St. Thomas and St. John and connects these islands to...
Authors
Caroline S. Rogers, Jeff Miller, Erinn Muller, Peter J Edmunds, Richard S. Nemeth, James P. Beets, Alan M. Friedlander, Tyler B. Smith, Rafe Boulon, Christopher F.G. Jeffrey, Charles Menza, Chris Caldow, Nasseer Idrisi, Barbara Kojis, Mark E. Monaco, Anthony S. Spitzack, Elizabeth H. Gladfelter, John C. Ogden, Zandy M Hillis-Star, Ian Lundgren, William B. Schill, Ilsa B. Kuffner, Laurie L. Richardson, Barry E. Devine, Joshua D. Voss
Ecotoxicology: Lead Ecotoxicology: Lead
Lead (Pb) is a naturally occurring metallic element; trace concentrations are found in all environmental media and in all living things. However, certain human activities, especially base metal mining and smelting; combustion of leaded gasoline; the use of Pb in hunting, target shooting, and recreational angling; the use of Pb-based paints; and the uncontrolled disposal of Pb-containing...
Authors
A.M. Scheuhammer, W. N. Beyer, C. J. Schmitt
Environmental contaminant hazards to wildlife at National Capital region and Mid-Atlantic National Park Service units Environmental contaminant hazards to wildlife at National Capital region and Mid-Atlantic National Park Service units
Pollutant data for air, water, soil and biota were compiled from databases and internet sources and by staff interviews at 23 National Park Service (NPS) units in 2005. A metric was derived describing the quality and quantity of data for each park, and in combination with known contaminant threats, the need for ecotoxicological study was identified and ranked. Over half of NP units were...
Authors
Barnett A. Rattner, B.K. Ackerson
Estimating sediment discharge: Appendix D Estimating sediment discharge: Appendix D
Sediment-discharge measurements usually are available on a discrete or periodic basis. However, estimates of sediment transport often are needed for unmeasured periods, such as when daily or annual sediment-discharge values are sought, or when estimates of transport rates for unmeasured or hypothetical flows are required. Selected methods for estimating suspended-sediment, bed-load, bed-...
Authors
John R. Gray, Francisco J. M. Simões
Estimating total population size for adult female sea turtles: Accounting for non-nesters Estimating total population size for adult female sea turtles: Accounting for non-nesters
Assessment of population size and changes therein is important to sea turtle management and population or life history research. Investigators might be interested in testing hypotheses about the effect of current population size or density (number of animals per unit resource) on future population processes. Decision makers might want to determine a level of allowable take of individual...
Authors
W. L. Kendall, J.I. Richardson
Fire and nonnative invasive plants in the central bioregion Fire and nonnative invasive plants in the central bioregion
The Central bioregion is a vast area, stretching from Canada to Mexico and from the eastern forests to the Rocky Mountains, dominated by grasslands and shrublands, but inclusive of riparian and other forests. This bioregion has been impacted by many human induced changes, particularly relating to agricultural practices, over the past 150 years. Also changed are fire regimes, first by...
Authors
James B. Grace, Kristin Zouhar
Fish Rhabdoviruses Fish Rhabdoviruses
Many important viral pathogens of fish are members of the family Rhabdoviridae. The viruses in this large group cause significant losses in populations of wild fish as well as among fish reared in aquaculture. Fish rhabdoviruses often have a wide host and geographic range, and infect aquatic animals in both freshwater and seawater. The fish rhabdoviruses comprise a diverse collection of...
Authors
Gael Kurath, J. Winton
Future intrusion of oxygenated glacial meltwaters into the Fennoscandian shield: A possibility to consider in performance assessments for nuclear-waste disposal sites? Future intrusion of oxygenated glacial meltwaters into the Fennoscandian shield: A possibility to consider in performance assessments for nuclear-waste disposal sites?
Provost et al. (1998) and Glynn and Voss (1999; also published in Glynn et al., 1999) considered the possibility that during future glaciations, oxygenated glacial meltwaters from two- to three-kilometer thick ice sheets could potentially intrude to the 500 m depth of planned nuclear-waste repositories. This possibility has been of concern because of potential negative effects on the...
Authors
Pierre Glynn
Geology of Hawaii reefs Geology of Hawaii reefs
The Hawaii hot spot lies in the mantle under, or just to the south of, the Big Island of Hawaii. Two active subaerial volcanoes and one active submarine volcano reveal its productivity. Centrally located on the Pacific Plate, the hot spot is the source of the Hawaii Island Archipelago and its northern arm, the Emperor Seamount Chain (Fig. 11.1). This system of high volcanic islands and...
Authors
Charles H. Fletcher, Christopher Bochicchio, Christopher L. Conger, Mary S. Engels, Eden J. Feirstein, Neil Frazer, Craig R. Glenn, Richard W. Grigg, Eric E. Grossman, Jodi N. Harney, Ebitari Isoun, Colin V. Murray-Wallace, John J. Rooney, Kenneth H. Rubin, Clark Sherman, Sean Vitousek